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I'm curious to see if anyone has found a fix or workaround for this issue.
I have just come across the issue on a vista machine using IE8.0.6001.18702. None of the Ext Chart examples are working and when I debug into ext-all-debug.js the error seems to be around the surface variable in the createSurface method. The surface variable contains a boolean value of false rather than the expected Ext component.